Name:
Class:
Date:
1. What does the brown color code represent in a SAE/ATA standard 7-wire trailer connector cord?
a.
auxiliary
b.
brakes
c.
ground
d.
tail and license plate lights
d
2. When an ATA standard seven-wire trailer cord is properly connected, what color wire is used for the trailer brake
lights?
a.
white
b.
blue
c.
red
d.
black
3. When selecting solder to splice copper wire, which would be correct?
a.
silver solder
b.
rosin core
c.
acid core
d.
pure lead solder
b
4. When adjusting headlights without the aid of a headlight aiming device, what should be the distance between the front
of the truck and the target screen?
a.
10 feet
b.
25 feet
c.
50 feet
d.
100 feet
b
5. In a typical truck, four horizontal headlight system where would the double filament headlamps be located?
a.
both on inside
b.
both on outside
c.
one on driver outside, one on curbside inside
d.
one on driver inside, one on curbside outside
b
6. What federal legislation limits the maximum brightness of truck headlamps?
a.
FMVSS 101
b.
FMVSS 104
c.
FMVSS 108
d.
FMVSS 121
7. What is the maximum brightness permitted in headlamps by current legislation?
a.
55,000 candle power
b.
75,000 candle power
c.
150,000 candle power
d.
200,000 candle power
d
8. Technician A says that when replacing a tungsten lightbulb element, you should avoid touching the bulb with your bare
hands. Technician B says that halogen headlights produce about twice as much brightness measure in candle power as
incandescent headlights. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
Name:
Class:
Date:
9. Most instrument panel display gauges are designed to display normal values in which areas of a circular display?
a.
12 to 4 o’clock
b.
10 to 2 o’clock
c.
3 to 9 o’clock
d.
4 to 8 o’clock
b
10. What color used to illuminate dash instrument displays is said to assist driver night vision?
a.
white
b.
blue
c.
green
d.
red
d
11. What is the function of an odometer?
a.
measures distance travelled
b.
displays temperature values
c.
measures road speed
d.
displays current consumed
12. What is the function of a tachometer?
a.
measures engine rpm
b.
measures road speed
c.
displays engine hours
d.
displays exhaust gas temperature
13. What is the function of a pyrometer?
a.
records chassis service hours
b.
measures exhaust gas temperature
c.
displays engine speed
d.
indicates boost pressure
b
14. When a truck has a data bus network, what type of switch can be used to replace an electro-mechanical switch?
a.
pilot switch
b.
toggle switch
c.
smart switch
d.
latching switch
15. In a typical incandescent bulb, what is the filament surrounded by?
a.
pure oxygen
b.
pure nitrogen
c.
inert gas
d.
vacuum
16. What maximum temperatures do the tungsten filaments in incandescent bulbs heat to in normal operation?
a.
110 degrees Fahrenheit
b.
1500 degrees Fahrenheit
c.
2500 degrees Fahrenheit
d.
over 4000 degrees Fahrenheit
d
17. What is visible light known as?
a.
electrons
b.
protons
c.
photons
d.
neutrons
Name:
Class:
Date:
18. Where would you most likely find fluorescent lights on a truck?
a.
not used on vehicles
b.
headlights
c.
marker lights
d.
sleeper and bunk lights
d
19. What is used to ignite the arc in a florescent light?
a.
spark
b.
heating element
c.
ballast resistor
d.
terminating resistor
20. Technician A says that halogen lamps produce more light per unit of energy consumed with the result that they are
more efficient. Technician B says that halogen lamps run at much higher temperatures than comparable incandescent
bulbs. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
21. What is another name for a high intensity discharge (HID) headlamp?
a.
tungsten lamp
b.
halogen lamp
c.
neon lamp
d.
xenon lamp
d
22. What produces the light emitted by a xenon headlamp?
a.
tungsten filament
b.
halogen filament
c.
arc ignited across inert gas
d.
infrared gas
23. How much voltage is required to ignite the arc of a HID headlamp?
a.
20,000 volts
b.
85 volts
c.
12 volts
d.
5 volts
24. After the arc has been ignited in a Xenon light, how much voltage is required to maintain it?
a.
20,000 volts
b.
85 volts
c.
12 volts
d.
5 volts
b
25. Technician A says that HID headlamps convert about 80% of the electrical energy they consume into light energy.
Technician B says that halogen lights use more energy but produce a 20% brighter beam than equivalent HID beams.
Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
Name:
Class:
Date:
26. Which of the following can significantly increase the life of all vehicle light systems?
a.
chassis voltage stabilizer
b.
increasing voltage regulator setting
c.
limiting alternator maximum speed
d.
replace at each PMI
27. Which American Trucking Association, Technology and Maintenance Council (TMC) recommended practice (RP)
outlines the placement of instrument cluster gauges?
a.
RP 401
b.
RP 285
c.
d.
28. Which of the following types of vehicle lamp is likely to function for the longest period?
a.
incandescent
b.
halogen
c.
LED
d.
HID
29. When comparing the safety of LEDs versus incandescent lamps used as brake lights, which of the following is
correct?
a.
LEDs require more maintenance
b.
cost of LEDs is greater over lifetime of chassis
c.
LEDs illuminate more rapidly
d.
LED tail lights consume more current
30. If a driver has 20/20 vision, how well is it estimated that the driver can see under night driving conditions?
a.
20/20
b.
20/30
c.
20/40
d.
20/50
d
31. What is the highest distance above the road level an HID headlamp can be positioned on the front of a truck?
a.
24 inches
b.
33.5 inches
c.
37.5 inches
d.
40 inches
b
32. What is the main cause of HID headlamp failures?
a.
burned out filaments
b.
vibration of lamp assembly
c.
oxidation of electrodes
d.
loss of inert gas
33. Technician A says that HID headlamps frequently fail because they are more vulnerable to road shock and vibration
than halogen filament lamps. Technician B says that when HID headlamps fail, it is usually due to frequent cycling. Who
is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
b
Name:
Class:
Date:
34. Why are LED light systems a major advantage on trailers equipped with ABS brakes?
a.
power for LED is sourced from ABS
b.
the PLC multiplex routes through LED circuit
c.
ABS logic controls LED light circuit
d.
LEDs require little power leaving more for the ABS during panic stops
d
35. Which medium do night visioning electronic systems such as Bendix XVision use to produce imaging?
a.
doppler radar
b.
infra-red
c.
ultra-violet
d.
microwave
b
36. If a steering column mounted stalk switch uses ‘smart’ technology, what does it produce to signal status changes?
a.
direct electro-mechanical signals
b.
sends command signals to a control module
c.
energizes dedicated hard wire circuits
d.
grounds-out live wires
b
37. When attempting to diagnose instrument cluster unit (ICU) malfunctions what should you do first?
a.
replace the module
b.
use a testlight to locate the problem
c.
use a DMM to locate the problem
d.
access the data bus for DTCs
d
38. The technology that superimposes dash display data onto the windshield within the driver’s line of sight is known as:
a.
DVD
b.
HUD
c.
HID
d.
LED
b
39. When soldering copper wire in medium gauge truck electrical circuits, what should be used to produce the heat?
a.
use cold melt solder only
b.
100 watt soldering gun
c.
500 watt soldering iron
d.
propane torch
b
40. A driver complains that his trailer marker lights continually cycle on-and-off, being illuminated for a couple of
minutes, then quit for up to five minutes. What type of circuit protection device is likely installed in the trailer marker
light circuit?
a.
blade type fuse
b.
ballast resistor
c.
SAE #1 circuit breaker
d.
SAE #2 circuit breaker
41. Which of the following circuit protection devices tend to be most commonly used in truck chassis electrical circuits?
Name:
Class:
Date:
a.
blade fuses
b.
solid state
c.
cycling circuit breakers
d.
non-cycling circuit breakers
42. What should you do to enable a non-cycling circuit breaker to close again after it has tripped and opened?
a.
replace it
b.
key off the ignition circuit to cool the breaker
c.
short it through with a jumper wire
d.
use aluminum foil to close terminals
43. When the control coil is energized in a standard SAE relay, which of the following relay circuits is switched to closed
status?
a.
1 – 2 (86 – 85)
b.
2 – 3 (85 – 30)
c.
3 – 4 (30 – 87a)
d.
3 – 5 (30 – 87)
44. On a standard SAE relay, which terminal should be the common terminal?
a.
1 (86)
b.
2 (85)
c.
3 (30)
d.
5 (87)
45. On a standard SAE relay, which two terminals are used to energize the coil or control circuit?
a.
1 and 2
b.
2 and 3
c.
3 and 4
d.
4 and 5
46. Technician A says that the typical current draw of headlamps is around 10 amps. Technician B says that headlamp
resistance should measure approximately 10 ohms in a properly functioning headlamp. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
47. Technician A says that a properly functioning LED light should produce mosty light energy from the electrical energy
it consumes. Technician B says that light systems that produce the least amount of heat are the most efficient. Who is
correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
48. Technician A says that voltage drop is the effective measurement of resistance in a circuit. Technician B says that
voltage drop is a less effective means of locating high resistances in a circuit than measuring resistance with an ohmmeter.
Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
Name:
Class:
Date:
49. When assessing chassis electrical system performance, where should you always begin?
a.
batteries
b.
alternator
c.
cranking motor
d.
power distribution module
50. With a truck ignition key-off and all electrical loads off, you disconnect the main ground battery cable and connect a
test light in series with the battery ground clamp and the battery ground post. The test light illuminates and remains
illuminated. What is the likely problem?
a.
Nothing
b.
Possible battery drain
c.
High resistance in the ground circuit
d.
Imminent battery failure
b